Starquad should not be individual twisted pairs, but a single twisted quad in an overall screen. The twin twin sounds like some sort of data cable, possibly for RS422 installation (not that I haven't used starquad for RS422), while the individual foil screens with a single drain wire should work fine for audio (actually, if your balancing is good, crosstalk at reasonably equivalent levels should be negligible. Won't vouch for hundred volt speaker level and mic level in the same cable, though, but come to think of it I did get away with a fifty metre run like this in telephone multipair, totally unscreened, in rather special circumstances…